# NTSB DCA18WA279: Boeing 737, N520AM, Guadalajara, Mexico, August 20, 2018

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Foreign investigation
- Date: August 20, 2018, 23:40 local (23:40 UTC)
- Place: Guadalajara, Mexico
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Defining event: [Enroute: Pressure/environ sys malf/fail](https://openairdocs.org/ntsb-events/331)
- Highest injury: No injuries
- Status: Led by another country's authority
- NTSB office: Major Investigations Division
- Lead agency: Other
- NTSB case key (mKey): 98223
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DCA18WA279
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/98223/pdf
- Page: https://openairdocs.org/ntsb/DCA18WA279

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Enroute: Pressure/environ sys malf/fail](https://openairdocs.org/ntsb-events/331) (defining event); cases with it: [Boeing 737-81Q, 1 case](https://openairdocs.org/ntsb-events/331/sequence.md?model=13844GE), [All aircraft, 116 cases](https://openairdocs.org/ntsb-events/331/sequence.md)

## Factual narrative

The government of Mexico has notified the NTSB of an accident involving a Boeing 737 airplane that occurred on August 20, 2018. The NTSB has appointed a U.S. Accredited Representative to assist the government of Mexico's investigation under the provisions of ICAO Annex 13.All investigative information will be released by the government of Mexico.

## Aircraft

- Registration: [N520AM](https://openairdocs.org/deregistered/N520AM-2021-02-09), registration cancelled 2021-02-09, S/N 29052, built 2000 (OpenAirDocs)
- Reported make and model: Boeing 737 (81Q)
- Registry model: [Boeing 737-81Q](https://openairdocs.org/model/boeing-737-81q) (registry code 13844GE) (OpenAirDocs)
- Registry engine: [CFM International CFM56-7B26 series](https://openairdocs.org/engine/cfm-international-cfm56-7b26-series) (registry code 13045, turbo-fan) (OpenAirDocs)
- Category: Airplane
- Serial number: 29052
- Engines: Cfm Intl CFM56-7B26 11521 horsepower turbo fan; Cfm Intl CFM56-7B26 11521 horsepower turbo fan
- Damage: No damage
- Flight: Non-U.S., commercial
- Operator: Aeromexico
- Registered owner: Wilmington Trust Co Trustee
- Airworthiness certificate: Standard, Transport

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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